Finishing device



Aug. 2s, 192s.

J. J. W. KENAN FINISHING DEVICE' Filed Feb. 9, 1927 Patented ug. 28, 1928.

V UNITED STATES PATENT OFFICE. ,N

VJorrit mw. RENAN. or Gitarren, rnnnsvnvnlva.

" FINISHING :envien Application fnefl February e, 1827. serial ne] 188,858.

`This invention relates "to `finishing devices and more in particular to devices for finishing the flat surfaces of parts made of wood, metal` g other similar abrasive. `Another object of this invention is to provide such a de vice which is substantially self-cleaning, that 1s, a

device wherein the removed portions of thematerial worked upon will not clog 1t up, thus i greatly impairing its eiiiciency. A further"` object of this invention is the provision of a iinishing device composed of numerous renewable cutting-members which are so disposed as to remove parts of the material to be finished by 'a gradual shearing action. Still another y obj eet is to provide a relatively simple finishing device which may beeasily assembled or dismantled for repair and `which will greatly ontlast the type of devices of similar purpose using discs of abrasive'ma-terial. Additional features and advantages of this invention will appear from the followingy description con-r sidered in connection with the `accompanyir'ig and in which:

embodiment of my invention.`

Fig. 2 is a sectional `view through the device; Fig. `3 is a fragmentary `front elevation showing a modified 'arrngenient of my device.

i Fig. 4 is also a fragmentary view showing another alternative ctnistructionl y Fig. 5 is a perspective viewshowing one of the finishing elements used in Fig. 4.

Figs. 6 to 11 are front and side elevations showing a few of thecutting elements used in the constructions illustrated kin Figs. 1 to 3.

Fig. 12 is a` eross-sectio`n through twoadj acent cutting` elements of the type shown in Figs. 6 toll, butwitha spacer-strip inserted between said elements to increase the clearance. l l

l Reference being had especially to Fig. 1, my finishing device comprises a flat disc-member 1 havinga downwardly directed peripheral flange Zand aeentral hub B in which is l the aperture t suitably tapped to aecomino# datethe mandrel of a lathe (not shown) upon which the disc-member is supported. The

finishing of any material is eifected by means of a clamping-ringnS of substantially y drawing forming a part of this application offagreat number of cuttingblades; each have ing a beveled cutting edge 5, and which are assembled closely together so as to nearly cover the whole surface of `the disc`-inember.

i As shown in said Fig. 1, the cutting-'blades are, assembled 1n groups each comprising a majorblade 6 and thecloselyheld minor-blades 7 `which are all disposed in parallel relation to the major-blade. The latterv entends from the periphery of the disc-member and is disv posedtangentiallyto an imaginary circle con` centric with the disq thus forming an acute angle MT with the I radial line passing through the `outer end of the blade.

The major and minorblades'are held at the periphery of therdis`c-member by means shaped cross-section, the vertical sideQ of `which fits snugly on the flange 2'of` the discmember, whereas the shorter and horizontal iside 10 isadapted tobear on the lugsll provided at the outer ends of said blades. Screws 21 are also shown for properlyseourn ing the clamping-ring on jthe` disc-member.

The inajorlblade and some of the longer minor-blades are secured at their inner ends by meansofthecenter-cap 12 comprising a hub 13 and the top-flange 14, `the latter bearing on the `lugs 15 cnt at theinnerends of said blades. The center-tap is `fastened on "the Fig. 1 is a front elevation of the preferred disc-inemberby means'fof a screw 16 which engages a suitably threaded hole provided at thefcenter of the disc-.1.ne1nbei.` 1A dowel-'pin 177 is also used to hold the `center-cap inthe slipping of the assembled `cutting-blades on the discfmember' is positively prevented.

` The minor-blades which do not extend under thetop-ilange 14e need not, ofcourse, have any lugs at the'inner ends; the latter are cut straight and bearagainst the rearward side of theprecedmg major-blade, see Figs'. 1 and 3g Uneofsuch bladesisyshown iii-Figs: 10 and 11. These `shorter blades a'reheld to` getherby means of pins 19;" onegor` more of :whiclrare riveted to each blade and `adapted ,to lit closely within elongated apertures 2O 'properly disposed in the next adjacent blade.

vThese pin-connections, `assistedby the pressure in the assembly "ofthe blades will more than suiiice to maintain the proper alignment of the latter under all operating conditions.

In Fig. 3 I havesliown a modified construci.

. the same reference number.

Figs. 4 and 5 illustrate a moditicationshow- .ing the useof tangentially dis osed major 'cutting-edges.

group 22 of cutting elements is machined out of a solid block, the minor cutting edges run- In this case eac ning all parallel to said major cutting edge.

These cutting edges, on account of being par allel, may be easily milled outto the proper angle and undercut to best suit the material to be inished, r Thistype of structure may be used preferabl `on the smaller sizes of. linishing devices iecause of the diiiculties, `encountered in hardening and grinding sec- As shown in the. drawing, these sectors may be fastened on tors of large dimensions.

the disc-memberin thesame manner `as described for the builtup groups of cutting ele t ments. Y

When the nature of the material torbe finished is such1 as to cause cloggin i of the cutting-blades,filler-stripsQB 1(seeig. 12)

y maybe inserted between the cuttingblades .to increase the clearance required to permit of the free escape of the material removed.

i .v Best results in finishing are obtained When the successive blades attack the `material at an angle, thus effecting, a gradual shearing action `beginning at the, outer end of each blade This `is best achieved by meansfof M the tangentially disposed cutting-blades, 4o`

since by this 'arrangement a gradual shearing action Will result regardless of the relative position of the piece to be finished on l the face of the device.

Y On the other' hand, if the radially disposed majorcutting-blades are used, gradual engagement of the latter `With the object to be finished can only beproi cured by presenting said objectV at a point .described, a plane rotatable disc-member; a

n above or below the horizontal center-line of the `:finishingdevice. `.When presented directly `on said centerfline, the object will be attacked at one time by the whole length of themajor-blade, as Willbe `readily understood by referring to Fig.` 3.

The mostadvantageous'method of assemfi-bling `a linishingdevice built as shown, vlor instance, in Fig. lis as follows: The majon l. blades Gare first spaced evenly on the discmember with the inner lugsabutting against `the teeth 1S on the center-hub 13. The minor-blades. are then successively Vlaid in i place, according totheirdecreasing lengths,

until each sector-like space is filled with blades,` due' care beingl taken thatnone of the "outer `blade-ends Vprotrude beyond the l, peripheryfot tliedisc-member. The clampsector-like f chisel. i i

ingfring 8 may now be placed about said disc-member and the screws 21 inserted. Fi-

nally, the center-cap is firmly screwed on, thus rigidly holding the `cutting-blades on the disc-member. a

To finish the flat surface ot' an object, the 'lormeris presented directly to the hnishing device `While rotating in the directionindr `cated by the arrows on the drawing and passed, slowlyacross the `tace of the device, ajsuitable rest (not shown) being, oi' course, used to properly guide the object in a similar manner as empio ed, for instance, on Wood turning lathes or guiding the i turningi Although my device is primarily intended for. finishing i'i'iachinepartsor patterns made i of `Wood,metal or other material, it may also be used to great advantage in combination with `Hoor-.finishing machines or, on any other kinds of work Where surfaceshave heretofore been `finished with sand-paper or analogous abrasives. L

Manychanges inthe precise construction, arrangement and conibination ot the various parts may be y made Without exceeding the scope of the claims, and I reserve the right to make all such changes as may be thought desirable. I claim: i i r i i i 1. In a finishing device of thecharacter described, a plane rotatableldisc-member; a 'plurality' `ot straight removable cutting` blades positioned onisaid d1sc-member and arranged ingroups, eachgroup comprising a straight major blade anda plurality oi straight minor blades disposed in parallel relationtosaidmajor blade, each ot' said major and minor blades having ,at its outer;`

end a lug; a clamping ring ot' substantially L-sliaped cross-section fitting about said discmeinberand adapted to engage simultaneous* ly said lugs, and a cap positioned" centrally on ends of said major blades and of some of said minor blades., V ,d

2. In a brushing device of the character "plurality removable 4cutting-blades posif,

.ing-ring offsubstantially L-shaped cross-section fitting about said disc-member and adapt' ed to engage Asimultaneously said lugs; and

a cap positioned centrally-on said disc-mem`- y Aber `ada ted to engage the inner ends of said major lades and oi' some of said minor blades; said major blades-being disposed tangentially 4to an imaginary circle concentric with the disc-member, for the purpose set forth. i i i said discmemberadapted to englge the inner lill llfl

3. ln a linishing device of the character` described, a plane rotatable .disc-member; a plurality oi' removable cutting-blades positioned on said disc-member and arranged in groups, each group comprising a straight major blade and a plurality of strr ight minor blades disposed in parallel relation to said major blade; a. lug positionedat the outer end of each major and minor blade; a clampingr-ing oi' substantially L-shaped crosssection iitting about said disc-member and adapted to engage simultaneously said lugs; a cap positioned centrally on said disc-ineni ber adapted to engage the inner ends of said major blades and of some of said minor blades, and teeth disposed circumferentially on said cap to serve as abutments for the inner ends oi said major blades.

il. ln a finishing device ot the character described, a plane rotatable Idisc-member; a plurality of removable cutting-blades positioned on said disc-member and arranged in groups, each group comprising a straight major blade and a plurality of straight minor blades disposed in'parallel relation to said major blade; a lug positioned at the outer end ot xach major blade and minor blade; `a lug positioned at the inner end oit' each major blade and of some oi' the minor blades; a clamping-ring of substantially L-shaped cross-section secured about said disc-member and adapted to engage simultaneously the lugs at the outer endsof vsaid blades, and a cap positioned centrally on said disc-member and comprising a hub and a top-flange adapted to clamp the lugs on the inner ends of the major blades and on some oi' the minor blades.

5. ln a linishing device of the character described, a plane rotatable disc-member; a plurality of removable cutting-blades positioned on said disc-meinber and arranged in groups, each group comprising a straight y major blade and a plurality of straight minor blades disposed in parallel relation to said major blade; a lug positioned at the outer end ci each major blade and minor blade; a lug positioned at the inner end of each major blade and ot some o-t the minor blades, a clamping-ring of `substantially L-shaped crosssection secured about said disc-member and adapted to engage simultaneously the lugs at the outer ends of said blades, a cap iliositioned centrally on said disc-member Vand comprising a hub and a top flange adapt-v ed to clamp the lugs on the inner endsof the major blades and on some ofthe minor blades, y

and teeth disposed circumferentally on said hub to serve as abutments tor the inner ends oi said major-blades. i e

6. lnl a n'nshing device 0i' the character described, a plane rotatable disc-n1ember; a plurality of removable cutting-blades positioned on said disc-member and arranged in groups; each group comprising a straight major blade and a plurality of straight minor blades disposed in parallel relation to said major blade; a lug positioned at theouter end of each major blade and minor blade; a lug positioned at the inner end of each major blade and of some of the minor blades; a

clamping-ring of substantially L-shaped y plurality ot removable cutting-blades positioned on `said disc-member and arranged in groups, each group( comprising a straight major blade and a plurality of straight minor blades disposed in parallel relation tosaid major blade; a lug positioned at theouter end of each major blade and minor blade; a

lug positioned at the inner end oteach major blade and of some of the minor blades; a clamping-ring oit substantially iL-shaped cross-section secured `about said disc-member and `adapted to engage simultaneously the lugs at the outer endsrof said blades; a cap positioned centrally on said Adisc-member and comprising a hub and a top-flange adapted to clamp the lugs on the inner ends of the major blades and on some of the minor blades; teeth disposed circumferentially on `saidhub to serve as abutments for theinner ends of said major`blades,and means for securing together the ends'of the minor blades j not secured by said central cap, said means consisting of pins secured to said minor blades adapted to engage slots positioned in the next adjacent blades. y y

In testimony whereof I affix my signature.

' JOHN J. W. KENAN. 

